I never understood why do you have to flame the Sambuca?
The idiot forgot to put out the flame before he drank it:
"Pour the Sambuca into a shot glass, and light it. You should see a small blue flame. Quickly place your palm over the glass. You should feel the suction (it will put the flame out). Remove your hand and quickly inhale the fumes from the glass. Immediately shoot down."
That's how you do it buddy!